State Estimation in Structural Systems with Model Uncertainties
Publication: Journal of Engineering Mechanics
Volume 134, Issue 3
Abstract
This paper presents an observer designed under the assumption that differences between predicted and measured outputs arise from discrepancies between the real structural system and the nominal model used to represent it. The observer gain is independent of the assumed model error parametrization and proves to be the transpose of the state to output matrix of a state space formulation. The estimated state with the proposed observer is shown to be identical to that obtained by exciting the nominal model with the known input while adjusting the measured portion of the state to match the measurements at the start of every step. Numerical experiments suggest that the proposed observer can provide state estimates that are substantially more accurate than results predicted by projecting the measurements in a truncated modal space.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 134 • Issue 3 • March 2008
Pages: 252 - 257
Copyright
© 2008 ASCE.
History
Received: Nov 29, 2005
Accepted: Jun 1, 2007
Published online: Mar 1, 2008
Published in print: Mar 2008
Notes
Note. Associate Editor: Lambros S. Katafygiotis
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